Taxonomy and phylogeny of Panus (Polyporales, Panaceae) in China and its relationship with allies

Abstract

Panus is a typical wood-rotting fungi, which plays considerable roles in ecosystems and has significant economic value. The genus Panus currently consists of more than 100 species; however, only eight species have been reported from China. This study aims to distinguish and describe two novel species from the Panus similis complex, namely Panus minisporus and Panus baishanzuensis, one new record species from Zhejiang Province, Panus similis and three common species, Panus conchatus, Panus neostrigosus and Panus rudis, based on detailed morphological and phylogenetic studies, relying on Chinese specimens. Panus minisporus is characterised by its reddish-brown pileus, decurrent lamellae with cross-veins, slender stipe, smaller basidiospores, wider generative hyphae and absence of sclerocystidia. Panus baishanzuensis is featured by its pileus with concentric and darker ring zone, decurrent lamellae with cross-veins, shorter stipe, longer basidiospores, diverse and shorter cheilocystidia and smaller sclerocystidia. Internal transcribed spacer (ITS) regions, large subunit nuclear ribosomal RNA gene (nLSU) and translation elongation factor 1-α gene (tef-1α) were employed to perform a thorough phylogenetic analysis for genus Panus and related genera, using Bayesian Inference and Maximum Likelihood analysis. The results indicate that Panus minisporus and Panus baishanzuensis form two independent clades within the Panus similis complex themselves. Detailed descriptions, taxonomic notes, illustrations etc. were provided. In addition, a key to the reported species of Panus from China is also provided.